[Dovecot] 1.0-test7

[Timo Sirainen]

http://dovecot.org/test/

Lots of bugfixes related to syncing. There's still some left.

Somewhat working mbox support:
  - combined syncing/rewriting uses much less disk I/O than with older 
mbox code
  - expunges aren't working yet
  - last-uid field in X-IMAPbase header isn't updated
  - it's currently syncing the whole mbox constantly even if it hasn't 
changed
  - it isn't hiding the mbox-specific headers from IMAP clients
  - if mbox hasn't changed, rewriting could start from the message which 
requires rewriting instead of syncing the whole mbox
  - syncing could keep the lock file extra two seconds to make sure if 
someone changes it the file's mtime changes -> as long as only Dovecot 
is modifying it, we'll never need to sync the whole mbox -> 
multi-gigabyte mboxes are still fast!

One nice thing about this mbox code is that it isn't exactly 
mbox-specific. Some people are still using formats which use eg. ^A as 
separator rather than From-line. Some people are using SMTP-formatted 
data directly ('.' as mail separator, '..' = normal line begins with 
'.'). These formats should be pretty easy to implement now as all 
mbox-specific code is in istream-raw-mbox.c file. I'll probably do that 
once mbox itself is fully working.
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